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k in (-oo:+oo)
5.6 = k/7 // - k/7
5.6-(k/7) = 0
5.6-1/7*k = 0 // - 5.6
-1/7*k = -5.6 // : -1/7
k = -5.6/(-1/7)
k = 39.20000078
k = 39.20000078
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